[Snyk] Security upgrade python from 3.7-alpine to 3-alpine

[snyk-bot]

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• ctfcli/templates/web/default/{{cookiecutter.name}}/Dockerfile

We recommend upgrading to python:3-alpine, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	571	Integer Overflow or Wraparound SNYK-ALPINE315-EXPAT-2342160	No Known Exploit
	471	Integer Overflow or Wraparound SNYK-ALPINE315-EXPAT-2342162	No Known Exploit
	471	Integer Overflow or Wraparound SNYK-ALPINE315-EXPAT-2342163	No Known Exploit
	571	Integer Overflow or Wraparound SNYK-ALPINE315-EXPAT-2342164	No Known Exploit
	571	Integer Overflow or Wraparound SNYK-ALPINE315-EXPAT-2342165	No Known Exploit

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